You must join the server by pressing the button "Join the server" above and contact the staff, or the user that made the staff listing.
Staff members are required to do multiple things not just one thing at a time. More will be discussed in the server.
Staff members do more than just one thing each we need staff members who could do a little bit of everything. This includes advertisement, member management, server observation, dependent on trust level you are able to show is what depends on whether you'll be an administrator or a moderator.